Dilute sulfuric acid is to be processed at room temperature in a cylindrical vessel with flat ends, and an inner diameter of 2m and length of 6m. During normal operating, the vessel is half full of liquid, and pressurized with nitrogen to 40 psig. The joints are fully radiographed single butt welds with a backing strip. Determine the following: a) A suitable material of construction b) The thickness of the cylindrical section, assuming a 14-in. corrosion allowance